
\draw[blue]
 (0.000000, 1.869687) --
 (2.000000, 0.853445) --
 (4.000000, 0.494788) --
 (6.000000, 0.292686) ;

 \draw (0.000000, 1.869687) node {$\star$};
 \draw (2.000000, 0.853445) node {$\star$};
 \draw (4.000000, 0.494788) node {$\star$};
 \draw (6.000000, 0.292686) node {$\star$};
